Which element in group 7A is not capable of having an expanded valence shell?

Question

Quizplus · Accepted Answer

Group 7A, also known as group 17, contains halogens which have seven valence electrons. They can form stable compounds by gaining one electron to achieve a full valence shell of eight electrons, known as an expanded octet. However, fluorine (choice B) is not capable of having an expanded valence shell due to its small size and high electronegativity.

Which Element in Group 7A Is Not Capable of Having